Whats up with vac?

I have a quick question. There are two electronics stores near me, Orvac and Marvac. We also all know of Rayovac. Where does this suffix vac come from? my neibhor said he thinks it has something to do with the first computer being based on vacuum tubes. Any help?

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Volts Alternating Current? the wall socket spits out 120 VAC?

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UNIVAC:  UNIVersal Automatic Computer
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John Fields

EDVAC = Electronic Discrete Variable Automatic Computer

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Andrew Holme

But wasn't Rayovac around in the early days of radio, when they tended to be run of batteries?


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Michael Black

ENIAC (1946)

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